Electronic Resource
Springer
Celestial mechanics and dynamical astronomy
73 (1999), S. 149-158
ISSN:
1572-9478
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The properties of chaos in 2D self-consistent models of barred galaxies are investigated using Kolmogorov-Sinai entropy hKS. These models are constructed with Schwarzschild's method which combines orbits as elementary building blocks. Most models are dominated by chaos near the 2/3 of the length of the bar and close to corotation. These locations correspond to regions where star forming HII regions are observed because gas clouds could shock, shrink and fragment such that star formation could be ignited. The model the most similar to N-body models shows a peak of hKS between the corners of the rectangular-like x1 orbits and the maximum extension points of the Lagrangian orbits. This emphasizes the role of Lagrangian orbits in the morphology of bars. Most models essentially contain 'semi-chaotic' orbits confined inside the corotation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1008394929716
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